<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html
    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <title>Qt 4.3: diagramitem.cpp Example File (graphicsview/diagramscene/diagramitem.cpp)</title>
  <link href="classic.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td>
<td width="1">&nbsp;&nbsp;</td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a>&nbsp;&middot; <a href="classes.html"><font color="#004faf">All&nbsp;Classes</font></a>&nbsp;&middot; <a href="mainclasses.html"><font color="#004faf">Main&nbsp;Classes</font></a>&nbsp;&middot; <a href="groups.html"><font color="#004faf">Grouped&nbsp;Classes</font></a>&nbsp;&middot; <a href="modules.html"><font color="#004faf">Modules</font></a>&nbsp;&middot; <a href="functions.html"><font color="#004faf">Functions</font></a></td>
<td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">diagramitem.cpp Example File<br /><sup><sup>graphicsview/diagramscene/diagramitem.cpp</sup></sup></h1>
<pre><span class="comment"> /****************************************************************************
 **
 ** Copyright (C) 2007-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. 
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/</span>

 #include &lt;QtGui&gt;

 #include &quot;diagramitem.h&quot;
 #include &quot;arrow.h&quot;

 DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
              QGraphicsItem *parent, QGraphicsScene *scene)
     : QGraphicsPolygonItem(parent, scene)
 {
     myDiagramType = diagramType;
     myContextMenu = contextMenu;

     QPainterPath path;
     switch (myDiagramType) {
         case StartEnd:
             path.moveTo(200, 50);
             path.arcTo(150, 0, 50, 50, 0, 90);
             path.arcTo(50, 0, 50, 50, 90, 90);
             path.arcTo(50, 50, 50, 50, 180, 90);
             path.arcTo(150, 50, 50, 50, 270, 90);
             path.lineTo(200, 25);
             myPolygon = path.toFillPolygon();
             break;
         case Conditional:
             myPolygon &lt;&lt; QPointF(-100, 0) &lt;&lt; QPointF(0, 100)
                       &lt;&lt; QPointF(100, 0) &lt;&lt; QPointF(0, -100)
                       &lt;&lt; QPointF(-100, 0);
             break;
         case Step:
             myPolygon &lt;&lt; QPointF(-100, -100) &lt;&lt; QPointF(100, -100)
                       &lt;&lt; QPointF(100, 100) &lt;&lt; QPointF(-100, 100)
                       &lt;&lt; QPointF(-100, -100);
             break;
         default:
             myPolygon &lt;&lt; QPointF(-120, -80) &lt;&lt; QPointF(-70, 80)
                       &lt;&lt; QPointF(120, 80) &lt;&lt; QPointF(70, -80)
                       &lt;&lt; QPointF(-120, -80);
             break;
     }
     setPolygon(myPolygon);
     setFlag(QGraphicsItem::ItemIsMovable, true);
     setFlag(QGraphicsItem::ItemIsSelectable, true);
 }

 void DiagramItem::removeArrow(Arrow *arrow)
 {
     int index = arrows.indexOf(arrow);

     if (index != -1)
         arrows.removeAt(index);
 }

 void DiagramItem::removeArrows()
 {
     foreach (Arrow *arrow, arrows) {
         arrow-&gt;startItem()-&gt;removeArrow(arrow);
         arrow-&gt;endItem()-&gt;removeArrow(arrow);
         scene()-&gt;removeItem(arrow);
         delete arrow;
     }
 }

 void DiagramItem::addArrow(Arrow *arrow)
 {
     arrows.append(arrow);
 }

 QPixmap DiagramItem::image() const
 {
     QPixmap pixmap(250, 250);
     pixmap.fill(Qt::transparent);
     QPainter painter(&amp;pixmap);
     painter.setPen(QPen(Qt::black, 8));
     painter.translate(125, 125);
     painter.drawPolyline(myPolygon);

     return pixmap;
 }

 void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
 {
     scene()-&gt;clearSelection();
     setSelected(true);
     myContextMenu-&gt;exec(event-&gt;screenPos());
 }

 QVariant DiagramItem::itemChange(GraphicsItemChange change,
                      const QVariant &amp;value)
 {
     if (change == QGraphicsItem::ItemPositionChange) {
         foreach (Arrow *arrow, arrows) {
             arrow-&gt;updatePosition();
         }
     }

     return value;
 }</pre>
<p /><address><hr /><div align="center">
<table width="100%" cellspacing="0" border="0"><tr class="address">
<td width="30%">Copyright &copy; 2008 <a href="trolltech.html">Trolltech</a></td>
<td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td>
<td width="30%" align="right"><div align="right">Qt 4.3.5</div></td>
</tr></table></div></address></body>
</html>
